參數(shù)資料
型號(hào)： TPS5211
廠商： Texas Instruments, Inc.
英文描述： HIGH FREQUENCY PROGRAMMABLE HYSTERETIC REGULATOR CONTROLLER
中文描述： 可編程滯高頻穩(wěn)壓控制器
文件頁(yè)數(shù)： 26/32頁(yè)
文件大?。?/td> 469K
代理商： TPS5211
TPS5211
HIGH FREQUENCY PROGRAMMABLE HYSTERETIC
REGULATOR CONTROLLER
SLVS243 – SEPTEMBER 1999
26
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
controller operation
Operation of the TPS5211 controller differs from a regular hysteretic controller. The additional ramp signal
through the input of the hysteretic comparator is formed by R11 and C7. The two signals are summed through
the inputs of the comparator. The two signals are the ramp signal from R11 - C7 circuitry and the signal from
the output converter. By proper selection of R11 and C7, one can get the amplitude of an additional ramp signal
which is greater than the output ripple of the converter. As a result, the switching frequency is greater while the
output ripple becomes lower. The additional ramp signal and output ripple waveforms are shown in Figure 23.
The switching frequency now depends on R11 and C7 values and does not depend on the output filter
characteristics including ESR, ESL, and C of the output capacitor (see frequency calculation section).
The dc feedback signal from the output of the converter through resistor R2 controls the dc level of the output
voltage. Because the switching frequency of TPS5211 is high and it does not depend on output capacitor
characteristics, low cost cermic or film capacitors can be used in a dc to dc converter while having the same
load current transient response characteristics.
Additional Ramp-Signal
t
Output Ripple
(VHI – VLO) – Hysteresis Window
(VMAX – VMIN) – Overshoot
Because of Delays
VHC
VMAX
VHI
VREF
VLO
VMIN
VO (P–P)
Figure 23. The Additional Ramp-Signal and Output Voltage Ripple Waveforms
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參數(shù)描述
TPS5211PWP 功能描述:IC REG CTRLR BUCK PWM 28-HTSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,000 系列:- PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR)
TPS5211PWPR 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC
TPS524 制造商:未知廠家 制造商全稱:未知廠家 功能描述:PHOTOVOLTAIC CELL FOR THERMOPILE DETECTION
TPS5300 制造商:TI 制造商全稱:Texas Instruments 功能描述:MOBILE CPU POWER SUPPLY CONTROLLER
TPS5300DAP 功能描述:DC/DC 開關(guān)控制器 Mobile CPU DC/DC Cntrlr RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
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